在显示可变值 <p> 在JavaScript中使用getElementById.innerHTML的段落

Question

I'm trying to write a Blackjack code using Javascript, and showing the result in an HTML page. 我正在尝试使用Javascript编写二十一点代码，并将结果显示在HTML页面中。 I have written the logic already, but I can't get to show the results in 我已经写了逻辑，但是我无法显示结果

paragraph by ID, using getElementById.innerHTML. 使用getElementById.innerHTML按ID分段。 I don't know how to make it right. 我不知道该怎么做。 Could you please help me with this? 你能帮我这个忙吗？ I'm running out of time :(. here's the code: 我没时间了:(。这是代码：

 <!DOCTYPE html> <html> <title>Welcome to Blackjack</title> <!--<link href="style.css" rel="stylesheet" type="text/css"> <!-- <script src="bj.js"></script> --> <head> <script> var PlayerScore = 0; var DealerScore = 0; var Winner = "Nobody"; var AskAgain = true; function random(maxValue) { return Math.floor(Math.random() * maxValue) + 1; } function pickSuit() { suit = random(4); if(suit == 1) return "Spades"; if(suit == 2) return "Clubs"; if(suit == 3) return "Diamonds"; return "Hearts"; } function cardName(card) { if(card == 1) return "Ace"; if(card == 11) return "Jack"; if(card == 12) return "Queen"; if(card == 13) return "King"; return ("" + card); } function cardValue(card) { if(card == 1) return 11; if(card > 10) return 10; return card; } function PickACard(strWho) { card = random(13); suit = pickSuit(); alert(strWho + " picked the " + cardName(card) + " of " + suit); return cardValue(card); } function Dealer() { while(DealerScore < 17) { DealerScore = DealerScore + PickACard("Dealer"); } } function User() { PlayerScore = PlayerScore + PickACard("You"); } function LookAtHands(Winner) { if(DealerScore > 21) { alert("House busts! You win!"); Winner = "You"; } else if((PlayerScore > DealerScore) && (PlayerScore <= 21)) { alert("You win!"); Winner = "You"; } else if(PlayerScore == DealerScore) { alert("Push!"); Winner = "Tie"; } else { alert("House wins!"); Winner = "House"; } } Dealer(); alert("Dealer's score is: " + DealerScore); document.getElementById('DealerScore').innerHTML = DealerScore; User(); alert("Your score is: " + PlayerScore); document.getElementById("DealerScore").innerHTML = "Dealer's score is: " + DealerScore; while (AskAgain == true ) { var answer = confirm("Do you want to draw a card?") if (answer == true) { User(); alert("Your score is: " + PlayerScore); document.getElementById("PlayerScore").innerHTML = "Your score is: " + PlayerScore; if (PlayerScore < 21) {AskAgain = true;} else {AskAgain = false;} } else { AskAgain = false; } } LookAtHands(); </script> </head> <body> <div><p>Welcome to our Blackjack Table!</p> <p id="PlayerScore">Your Score is: </p> <p id="DealerScore">Dealer's Score is: </p> </div> </body> </html>

Answer 1

As @nnnnnn has mentioned that your html tags are not even loaded when your JS has executed and hence the issue. 正如@nnnnnn所提到的，当您的JS执行时，甚至没有加载html标记，因此出现了问题。 Try something like below to correct the issue: 请尝试以下类似方法来更正此问题：

 <!DOCTYPE html>
<html>
<title>Welcome to Blackjack</title>
<!--<link href="style.css" rel="stylesheet" type="text/css">

<!-- <script src="bj.js"></script> -->
<head>
<script>
var PlayerScore = 0;
var DealerScore = 0;
var Winner = "Nobody";
var AskAgain = true;

function random(maxValue)
{
 return Math.floor(Math.random() * maxValue) + 1;
}

function pickSuit()
{
 suit = random(4);

 if(suit == 1)
 return "Spades";

 if(suit == 2)
 return "Clubs";

 if(suit == 3)
 return "Diamonds";

 return "Hearts";
}

function cardName(card)
{
 if(card == 1)
 return "Ace";

 if(card == 11)
 return "Jack";

 if(card == 12)
 return "Queen";

 if(card == 13)
 return "King";

 return ("" + card);
}

function cardValue(card)
{
 if(card == 1)
 return 11;

 if(card > 10)
 return 10;

 return card;
}

function PickACard(strWho)
{
 card = random(13);
 suit = pickSuit();

 alert(strWho + " picked the " + cardName(card) + " of " + suit);

 return cardValue(card);
}

function Dealer()
{
 while(DealerScore < 17)
 {
 DealerScore = DealerScore + PickACard("Dealer");
 }
}

function User()
{
    PlayerScore = PlayerScore + PickACard("You");

}
function LookAtHands(Winner)
{
 if(DealerScore > 21)
 {
 alert("House busts! You win!");
 Winner = "You";
 }
 else
 if((PlayerScore > DealerScore) && (PlayerScore <= 21))
 {
 alert("You win!");
  Winner = "You";
 }
 else
 if(PlayerScore == DealerScore)
 {
 alert("Push!");
  Winner = "Tie";
 }
 else
 {
 alert("House wins!");
  Winner = "House";
 }
}
</script>
</head>
<body>
<div><p>Welcome to our Blackjack Table!</p>
<p id="PlayerScore">Your Score is: </p>
<p id="DealerScore">Dealer's Score is: </p>
</div>
<script>

Dealer();
alert("Dealer's score is: " + DealerScore);
document.getElementById('DealerScore').innerHTML = DealerScore;


User();
alert("Your score is: " + PlayerScore);
document.getElementById("DealerScore").innerHTML = "Dealer's score is: " + DealerScore;


while (AskAgain == true )
{
    var answer = confirm("Do you want to draw a card?")
    if (answer == true)
    {
        User();
        alert("Your score is: " + PlayerScore);
        document.getElementById("PlayerScore").innerHTML = "Your score is: " + PlayerScore;

        if (PlayerScore < 21)
            {AskAgain = true;}

        else 
            {AskAgain = false;}
    }
    else
    {
        AskAgain = false;
    }
}
LookAtHands();
</script>
</body>
</html>

Answer 2

your script is loading before the document that has the elements in it. 您的脚本正在其中包含元素的文档之前加载。 Enclose your script in: 将脚本包含在：

window.onload=function() {
    //all of your JavaScript code
}

在显示可变值 <p> 在JavaScript中使用getElementById.innerHTML的段落

问题描述

2 个解决方案

解决方案1
0 已采纳 2016-02-27 03:04:11

解决方案2
0 2016-02-27 03:04:34

在显示可变值 <p> 在JavaScript中使用getElementById.innerHTML的段落

问题描述

2 个解决方案

解决方案1 0 已采纳 2016-02-27 03:04:11

解决方案2 0 2016-02-27 03:04:34

解决方案1
0 已采纳 2016-02-27 03:04:11

解决方案2
0 2016-02-27 03:04:34